Yeah, I've seen those rigs and am slightly considering it. Would have to get a new TV stand though as I couldn't fit another thing the size of a receiver in my current one. I do want to get a nicer one sometime relatively soon anyway--preferably something with doors to keep things more out of sight.
My other gaming PC hesitation is that I really would prefer something that could be operated totally with a controller so I don't have to keep a wireless keyboard/mouse around and hassle with finding somewhere to keep them out of sight, but also handy. Yes, I'm OCD about how near and organized things are in my home.